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+/*
+This exercise demonstrates the first workflow consisting of multiple
+steps.  We will build upon the previous example by using the string
+produced in exercise 1 as input to this workflow. You can see how other
+files can be imported and used in the construction of workflows using
+`callBionix`, which imports a file and passes it `bionix` along with
+potentially some additional arguments.
+
+Goal: fill out the stage here to reverse the string using the `rev`
+program, which reads lines on stdin and writes them to stdout with the
+characters reversed. You will need to choose exactly *which* rev you
+want to use in `buildInputs`: there are three providers available
+(busybox, toybox, utillinux) and you can try them all.
+
+Bonus: change the last line to call rev twice, thereby reversing the
+strings back to the original orientation
+*/
+{bionix}:
+with bionix; let
+  hello-world = callBionix ../ex1-hello-world {};
+
+  rev = input:
+    stage {
+      name = "rev";
+      buildInputs = [];
+      buildCommand = ''
+      '';
+    };
+in
+  rev hello-world